Fraction Addition Calculator

To add fractions, you need a common denominator. The calculator finds the least common multiple (LCM) of all denominators, converts each fraction, adds the numerators, and simplifies the result using the greatest common divisor (GCD).

Yes! Enter as many fractions as you want, separated by + or commas. The calculator handles 2, 3, 5, 10, or even 100 fractions with automatic simplification.

No problem. The tool automatically finds the least common denominator and converts all fractions before adding. For example, 1/3 + 1/6 becomes 2/6 + 1/6 = 3/6 = 1/2.

Yes, automatically. The result is always reduced to lowest terms. For example, 2/4 + 1/4 = 3/4, not 3/4 already simplified, but 4/8 would become 1/2.

Yes. Enter negative fractions like -1/2 or 1/-2. The calculator handles mixed positive and negative values correctly and shows the simplified signed result.

Absolutely. All calculations happen entirely in your browser using client-side JavaScript. No fractions or data are uploaded to any server, ensuring complete privacy.

Yes, completely free with no registration, ads, or hidden fees. Use it unlimited times for homework, recipes, construction, or any fraction math.

The calculator validates your input and shows a clear error message if you enter something like 1/0 (division by zero) or non-numeric values. Just fix the error and try again.

Perfect for recipes! Add fractions like 1/2 cup + 1/4 cup + 1/8 cup to see the total ingredient amount needed when combining or doubling recipes.

Once the page loads, it works completely offline. All the calculation logic runs locally in your browser, no internet connection required.